#!/usr/bin/env bash
set -euo pipefail

function log() {
  echo "[$(date +%H:%M:%S)] $@" >&2
}

[[ -n $GITHUB_REF_NAME ]] || {
  log "ERR: This script is intended to run on a Github Action only."
  exit 1
}

repo="ghcr.io/${GITHUB_REPOSITORY,,}"
tags=()

case "${GITHUB_REF_TYPE}" in
branch)
  # Generic build to develop: Workflow has to limit branches to master
  tags+=(develop)
  ;;
tag)
  # Build to latest: Older tags are not intended to rebuild
  tags+=(develop latest ${GITHUB_REF_NAME})
  ;;
*)
  log "ERR: The ref type ${GITHUB_REF_TYPE} is not handled."
  exit 1
  ;;
esac

log "Building Docker image..."
docker build -t "${repo}:local" .

for ref in "${tags[@]}"; do
  log "Pushing Docker image to '${repo}:${ref}'..."
  docker tag "${repo}:local" "${repo}:${ref}"
  docker push "${repo}:${ref}"
done

log "Publish finished."